Burke: Rorippa tenerrima vs. Rorippa curvisiliqua

	Rorippa tenerrima	Rorippa curvisiliqua
	Modoc yellowcress	western yellowcress
Habit		Mostly glabrous annual or biennial herbs, the stems 1-4 dm. tall, diffusely branched to simple and branched only above.
Leaves		Leaves variable, 2-7 cm. long, mostly oblong-oblanceolate, entire, toothed, pinnately parted or pinnatifid, the segments linear to ovate, entire or toothed.
Flowers		Inflorescence of bractless racemes; pedicles spreading, 2-4 mm. long; sepals 4, 1-2 mm. long; petals 4, yellow, 1-2 mm. long; stamens 6; style 0.3-1 mm. long.
Fruits		Siliques 6-15 mm. long and 1-1.5 mm. broad, nearly terete, usually curved; seeds in 2 series.

	Rorippa tenerrima	Rorippa curvisiliqua
Flowering time	June-August	May-September
Habitat	Lakeshores and other wet areas, lowland to montane.	Stream banks, pond edges, and seasonally wet soils, low to mid-elevations in the mountains
Distribution	Occurring east of the Cascades crest in Washington; British Columbia to California, east to the central U.S. [WildflowerSearch map] [BONAP county map]	Occurring on both sides of the Cascades crest in Washington; British Columbia to California, east to Montana and Colorado. [WildflowerSearch map] [BONAP county map]
Origin	Native	Native
Conservation status	Not of concern	Not of concern
Sibling taxa	R. austriaca, R. columbiae, R. curvipes, R. curvisiliqua, R. palustris, R. sinuata, R. sphaerocarpa, R. sylvestris	R. austriaca, R. columbiae, R. curvipes, R. palustris, R. sinuata, R. sphaerocarpa, R. sylvestris, R. tenerrima
Web links	Local floras: BC, CA, OR, WA Local Web sites: CalFlora, CalPhotos, Flora NW, PNW Herbaria WildflowerSearch iNaturalist (observations) USDA Plants Database LBJ Wildflower Center SEINet Plants of the World Online Encyclopedia of Life Wikipedia Google Image Search	Local floras: BC, CA, OR, WA Local Web sites: CalFlora, CalPhotos, Flora NW, PNW Herbaria, Turner Photog. WildflowerSearch iNaturalist (observations) USDA Plants Database LBJ Wildflower Center SEINet Plants of the World Online Encyclopedia of Life Wikipedia Google Image Search

Rorippa tenerrima

Rorippa curvisiliqua

Modoc yellowcress

western yellowcress

Habit

Mostly glabrous annual or biennial herbs, the stems 1-4 dm. tall, diffusely branched to simple and branched only above.

Leaves

Leaves variable, 2-7 cm. long, mostly oblong-oblanceolate, entire, toothed, pinnately parted or pinnatifid, the segments linear to ovate, entire or toothed.

Flowers

Inflorescence of bractless racemes; pedicles spreading, 2-4 mm. long;

sepals 4, 1-2 mm. long;

petals 4, yellow, 1-2 mm. long;

stamens 6;

style 0.3-1 mm. long.

Fruits

Siliques 6-15 mm. long and 1-1.5 mm. broad, nearly terete, usually curved;

seeds in 2 series.